Did Snape learn from Lily and James?

[Auria]

No: HPFGUIDX 139050

 
I had a thought while rereading HBP and wanted to share comments from 
everyone - apologies if this theory has already been put forward as I 
am a little behind with the posts.

When it is revealed that the HBP is Snape, it first appears that he 
was a gifted potions student and spell-crafter from the scribbled 
notes in the potions text book. However it occurred to me that maybe 
Snape was actually writing these tips and spells in his text book 
because he was learning and copying them from other students - namely 
Lily and James Potter.  The canon for this is firstly we know that 
Lily was a gifted potions student from what Slughorn informs Harry. 
We also know that Snape was in the same classes - so maybe he just 
wrote down everything that Lily did during their classes which 
deviated and improved from the text book instructions. This fits with 
Snape's character as he seems very ambitious and competitive, and 
would of course claim credit for himself if he could.

 We also know that the spell 'Levicorpus' which Harry found written 
in his textbook, was performed by James Potter on Snape as seen by 
Harry in the pensieve in book 5.  So perhaps Snape scribbled down 
this jinx in his potions text book after he had been a victim of it, 
in case it came in handy for him later?

In other words its possible that the tips and spells Harry is 
learning from the HBP text book in fact originated from his parents 
talents, and that Snape just copied them down and learnt from them 
himself, but of course would never admit it.

Again this may have already been discussed and I just missed seeing 
the posts, so do correct me if this is the case.  

Auria